html, body {
    margin: 8%;       /* remove the default margin          */
    margin-top: 0%;
    margin-bottom: 0%;
    /*height: 100%;    /* make the html,body fill the page   */
    background-color: rgb(64, 64, 64);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

main {
    background-color: rgb(205, 205, 205);
    padding: 2%;
    margin-left: auto;
    margin-right: auto;
    margin-top: 0%;
    margin-bottom: 0%;
}

p {
    padding-left: 1%;
    padding-right: 1%;
}

div {
    display: inline-block;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1%;
    padding-right: 1%;
}

select, button, input {
    font-family: inherit;
    border: 0px solid;
    padding: 6px;

    background-color: #adadad;
    border-color: #484848;
}

.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 0px;
    border-radius: 20px;
    border-color: #484848;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px; 
    height: 25px; 
    background-color: #484848; 
    border-radius: 20px;
    cursor: pointer;
}

/*
.checkbox {
    -webkit-appearance: none;
    appearance: none;
    width: 10px;
    height: 10px;
}

.checkbox input:checked {
    background-color: #00ff40;
}
*/

canvas {
    width:  900px;
    height: 600px;
    margin: auto;
    display: block;
}